I always have a problem dealing with mass stalker, as every race. Massing lings and hydras can only take so much, infestors take my micro from the lings, and ultras are too far down the tree. Marauders need that etch lab I always forget to build, and I always refuse to get into a stalker vs stalker fight. Because while it is comical to see two stalkers fight each other for the right to creep on someone, its annoying.